feat: add HTTP healthcheck endpoint via quarkus-smallrye-health

- pom.xml: add quarkus-smallrye-health dependency.
  Exposes /q/health/live and /q/health/ready endpoints (liveness
  and readiness probes for Quarkus apps).
- Dockerfile: install curl-minimal in the microdnf layer so the
  container has a real HTTP client. quarkus-micro-image is based
  on UBI 9 minimal and doesn't ship with curl by default.
- compose.yaml: healthcheck now hits GET /q/health/live with
  curl -f instead of the previous kill -0 1 (which only proved
  the process was alive, not that the HTTP server was responding).

The next CI run will rebuild the native binary with the health
extension baked in; old images pulled from :latest will keep
working since this is additive.

Dockerfile

@@ -2,7 +2,8 @@ FROM quay.io/quarkus/quarkus-micro-image:2.0
 WORKDIR /work/
 COPY build-output/shot-crafter-calculator-1.0.0-runner /work/application
 
-RUN chmod 775 /work /work/application \
+RUN microdnf install -y curl-minimal && microdnf clean all \
+  && chmod 775 /work /work/application \
   && chown -R 1001 /work \
   && echo "securerandom.source=file:/dev/urandom" >> /work/application
 

compose.yaml

@@ -44,9 +44,9 @@ services:
     volumes:
       - shot-crafter-data:/work/data
     healthcheck:
-      # La imagen native es PID 1. kill -0 chequea que sigue vivo
+      # curl contra /q/health/live (extension quarkus-smallrye-health).
-      # sin mandar señal. Devuelve 0 si existe, 1 si no.
+      # Devuelve 200 si la app esta viva. -f falla si el status != 2xx.
-      test: ["CMD-SHELL", "kill -0 1 || exit 1"]
+      test: ["CMD", "curl", "-fsS", "--max-time", "5", "http://localhost:8080/q/health/live"]
       interval: 30s
       timeout: 5s
       retries: 3

pom.xml

@@ -68,6 +68,10 @@
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-smallrye-jwt-build</artifactId>
         </dependency>
+        <dependency>
+            <groupId>io.quarkus</groupId>
+            <artifactId>quarkus-smallrye-health</artifactId>
+        </dependency>
         <dependency>
             <groupId>io.quarkus</groupId>
             <artifactId>quarkus-elytron-security-common</artifactId>